J-League club Yokohama F-Marinos fined for fan's racist banana waving

Japanese club Yokohama F-Marinos was hit with a $US48,000 ($A51,311) fine by the J-League after a supporter racially abused a black player during a game last weekend.

A video showing a fan waving a banana at Kawasaki Frontale's Brazilian striker Renato lit up social media and Yokohama promptly identified the culprit and banned him for life.

"The club dealt with the case appropriately but we did not feel they were doing enough to raise awareness (of racism), as is their responsibility," J-League chairman Mitsuru Murai told reporters.

The J-League was widely expected to come down heavily on Yokohama after fans and players alike expressed their anger at the incident, with former Japan defender Yuji Nakazawa, who plays for F-Marinos, slamming the racist abuse as "pathetic".

However, Yokohama appear to have escaped lightly, despite strong remarks made by Murai earlier this week condemning the incident and describing it as a major blow in their fight to weed out discrimination in the J-League.

Earlier this year, Urawa Reds were ordered to play a J-League game behind closed doors after fans unfurled a banner reading "Japanese only" over one of the stadium entrances.

The Reds, Japan's best-supported team, were also fined five million yen ($A51,311) in 2010 following racial abuse of foreign players.

There is a history of bad blood between supporters of Yokohama and Kawasaki, who have clashed at recent games, while sporadic racist taunts have also crept into the rivalry between the regional neighbours.